@article{GDZPPN001250191, title = {Problems 44 and 39 on compact semilattices.}, journal = {Semigroup forum}, volume = {7}, year = {1974}, pages = {179-180}, zbl = {0285.22006}, url = {http://dml.mathdoc.fr/item/GDZPPN001250191} }
Lau, A.Y.W. Problems 44 and 39 on compact semilattices.. Semigroup forum, Tome 7 (1974) pp. 179-180. http://gdmltest.u-ga.fr/item/GDZPPN001250191/